From owner-freebsd-fs@FreeBSD.ORG Fri Mar 26 18:21:22 2010 Return-Path: Delivered-To: freebsd-fs@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 7D2C5106564A; Fri, 26 Mar 2010 18:21:22 +0000 (UTC) (envelope-from dimitry@andric.com) Received: from tensor.andric.com (cl-327.ede-01.nl.sixxs.net [IPv6:2001:7b8:2ff:146::2]) by mx1.freebsd.org (Postfix) with ESMTP id 0BCB48FC17; Fri, 26 Mar 2010 18:21:22 +0000 (UTC) Received: from [IPv6:2001:7b8:3a7:0:8009:ab55:dc54:fb7f] (unknown [IPv6:2001:7b8:3a7:0:8009:ab55:dc54:fb7f]) (using TLSv1 with cipher DHE-RSA-CAMELLIA256-SHA (256/256 bits)) (No client certificate requested) by tensor.andric.com (Postfix) with ESMTPSA id 50D8C5C59; Fri, 26 Mar 2010 19:21:20 +0100 (CET) Message-ID: <4BACFB20.6070601@andric.com> Date: Fri, 26 Mar 2010 19:21:20 +0100 From: Dimitry Andric User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.2; en-US; rv:1.9.2.2pre) Gecko/20100311 Lanikai/3.1b2pre MIME-Version: 1.0 To: Jeremy Chadwick References: <4BACB3F5.7010905@freebsd.org> <201003261528.o2QFSAuI037251@chez.mckusick.com> <20100326161539.GA10618@icarus.home.lan> In-Reply-To: <20100326161539.GA10618@icarus.home.lan> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Cc: Kirk McKusick , freebsd-fs@freebsd.org, Andriy Gapon , freebsd-geom@freebsd.org Subject: Re: g_vfs_open and bread(devvp, ...) X-BeenThere: freebsd-fs@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Filesystems List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 26 Mar 2010 18:21:22 -0000 On 2010-03-26 17:15, Jeremy Chadwick wrote: > I should note that they already have grown: Western Digital, as of a few > months ago, began shipping drives that use 4KByte sectors. ... > A discussion and an including an incredibly cheesy video review are > below. The video review does discuss the 4KB sector size, in addition > to jumpers that revert the drive to using 512-byte sectors for older > OSes such as Windows XP -- and presumably FreeBSD. Please note these drives *always* expose 512-byte sectors to any OS, at least for now. The jumper you refer to is only a hack to force sector 63 (the usual starting position for the first partition) to be aligned on a 4096-byte boundary. If you would remove it after partitioning, all sectors would shift up one sector, and there would be trouble. :)